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Issue 19, 2015
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Tinene: a two-dimensional Dirac material with a 72 meV band gap

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Dirac materials have attracted great interest for both fundamental research and electronic devices due to their unique band structures, but the usual near zero bandgap of graphene results in a poor on–off ratio in the corresponding transistors. Here, we report on tinene, monolayer gray tin, as a new two-dimensional material with both Dirac characteristics and a remarkable 72 meV bandgap based on density functional theory calculations. Compared with silicene and germanene, tinene has a similar hexagonal honeycomb monolayer structure, but it has an obviously larger buckling height (∼0.70 Å). Interestingly, such a moderate buckling structure results in phonon dispersion without appreciable imaginary modes, indicating the strong dynamic stability of tinene. Significantly, a distinct transformation is discovered from the band structure that six Dirac cones would appear at high symmetry K points in the first Brillouin zone when gray tin is thinned from the bulk to monolayer, but a bandgap as large as 72 meV is still preserved. Considering the recent successful realization of silicene and germanene with a similar structure, the predicted stable tinene with Dirac characteristics and a suitable bandgap is a possibility for the “more than Moore” materials and devices.

Graphical abstract: Tinene: a two-dimensional Dirac material with a 72 meV band gap

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Publication details

The article was received on 29 Jan 2015, accepted on 24 Mar 2015 and first published on 24 Mar 2015

Article type: Paper
DOI: 10.1039/C5CP00563A
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Phys. Chem. Chem. Phys., 2015,17, 12634-12638

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    Tinene: a two-dimensional Dirac material with a 72 meV band gap

    B. Cai, S. Zhang, Z. Hu, Y. Hu, Y. Zou and H. Zeng, Phys. Chem. Chem. Phys., 2015, 17, 12634
    DOI: 10.1039/C5CP00563A

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